how do I match speedo to new gears? - 2003-04 Mach 1 Registry Owners Club

SHOW SOME · 09-28-2008, 09:25 PM

I put 4.10's in and I think my mechanic forgot to change the car to match the gears. cause everything seems the same. and it says i'm doing like 70 and i figure around 55. I have the sct xcal2.

KEVINC66 · 09-28-2008, 09:40 PM

You should be able to use your tuner to change your speedo,thats what I did.You can also do what I did to check it,have someone drive next to you on a deserted highway at different speeds,to check your speedo at different speeds.The reason I say this is because when my speedo was off,it was really off when I was driving at a faster speed.Good luck.

FlyMACH1 · 09-28-2008, 10:50 PM

Quote:

Originally Posted by SHOW SOME

I put 4.10's in and I think my mechanic forgot to change the car to match the gears. cause everything seems the same. and it says i'm doing like 70 and i figure around 55. I have the sct xcal2.

This may be a dumb question, but - did you tell the mechanic to adjust it and give him the tuner?
I just did mine myself with the Predator after I got it home from the shop

SHOW SOME · 09-28-2008, 11:34 PM

yes i gave him the tuner and he knew he was supposed to do it. I just think maybe since i gave him $5000 in parts to install he might have forgot that. I can't figure out how to change it on my tuner. can anyone help?

04mach_man · 09-29-2008, 09:37 AM

Quote:

Originally Posted by SHOW SOME

yes i gave him the tuner and he knew he was supposed to do it. I just think maybe since i gave him $5000 in parts to install he might have forgot that. I can't figure out how to change it on my tuner. can anyone help?

its pretty easy go to axle change the ratio to 4:10 and also tire revs per mile if you changed the tires size from factory.. should be good to go after that.

KEVINC66 · 09-29-2008, 10:13 AM

On the revs per mile,there's a formula that you use to get what number you have.In the tuner there's a number of different numbers,you use the one closes to what you have.I don't know the formula,I called a SCT tech and gave him my tire size and he gave me my revs per mile,then I went into the tuner and picked the closes number to what I have.Later.

FlyMACH1 · 09-29-2008, 07:01 PM

The tire makers web site should have the revs-per-mile info for each particular tire they make on a spec sheet

09-28-2008, 09:25 PM	#1
SHOW SOME Registered User Join Date: Jul 2008 Location: albany, ny Posts: 143	how do I match speedo to new gears? I put 4.10's in and I think my mechanic forgot to change the car to match the gears. cause everything seems the same. and it says i'm doing like 70 and i figure around 55. I have the sct xcal2. __________________ 2003 azure blue mach 1 5 speed JLT cai/rai BBK long tube headers BBK o/r H mid pipe SLP Loudmouth SCT tuner PHP Intake spacer MGW short shifter Accufab twin 60mm TB Spec aluminum flywheel Spec stage 2 clutch FRPP aluminum DS FRPP 31 spline traction lok diff. FRPP 4.10's Moser 31 spline axles Zex 125 shot, dual purge lines, and window switch slp line lock 303rwhp/305rwtq 376rwhp on the bottle

09-28-2008, 09:40 PM	#2
KEVINC66 Registered User Join Date: Oct 2006 Location: Corpus Christi, Texas Posts: 945	Re: how do I match speedo to new gears? You should be able to use your tuner to change your speedo,thats what I did.You can also do what I did to check it,have someone drive next to you on a deserted highway at different speeds,to check your speedo at different speeds.The reason I say this is because when my speedo was off,it was really off when I was driving at a faster speed.Good luck. __________________ 2000 GT vert,03 Mach1 engine,auto, shaker hood,Mach1 brakes,C&L CAI,K&N,Tokico D Spec,UPR Coilover K frame with Steeda front sway bar,rear upper and lower control arms,4.30's,FRPP aluminum DS,17x9 deep dish chrome Mach1 rims with 275x40x17 Fuzion Z1's,Mac Catbac with 3 1/2 chrome tips,honeycomb rear panel,front Mach1 chin spoiler,Mach1 grill delete kit,polished aluminum gas cap.

09-28-2008, 11:34 PM	#4
SHOW SOME Registered User Join Date: Jul 2008 Location: albany, ny Posts: 143	Re: how do I match speedo to new gears? yes i gave him the tuner and he knew he was supposed to do it. I just think maybe since i gave him $5000 in parts to install he might have forgot that. I can't figure out how to change it on my tuner. can anyone help? __________________ 2003 azure blue mach 1 5 speed JLT cai/rai BBK long tube headers BBK o/r H mid pipe SLP Loudmouth SCT tuner PHP Intake spacer MGW short shifter Accufab twin 60mm TB Spec aluminum flywheel Spec stage 2 clutch FRPP aluminum DS FRPP 31 spline traction lok diff. FRPP 4.10's Moser 31 spline axles Zex 125 shot, dual purge lines, and window switch slp line lock 303rwhp/305rwtq 376rwhp on the bottle

09-29-2008, 10:13 AM	#6
KEVINC66 Registered User Join Date: Oct 2006 Location: Corpus Christi, Texas Posts: 945	Re: how do I match speedo to new gears? On the revs per mile,there's a formula that you use to get what number you have.In the tuner there's a number of different numbers,you use the one closes to what you have.I don't know the formula,I called a SCT tech and gave him my tire size and he gave me my revs per mile,then I went into the tuner and picked the closes number to what I have.Later. __________________ 2000 GT vert,03 Mach1 engine,auto, shaker hood,Mach1 brakes,C&L CAI,K&N,Tokico D Spec,UPR Coilover K frame with Steeda front sway bar,rear upper and lower control arms,4.30's,FRPP aluminum DS,17x9 deep dish chrome Mach1 rims with 275x40x17 Fuzion Z1's,Mac Catbac with 3 1/2 chrome tips,honeycomb rear panel,front Mach1 chin spoiler,Mach1 grill delete kit,polished aluminum gas cap.

09-29-2008, 07:01 PM	#7
FlyMACH1 Giant Member Join Date: Jun 2005 Location: Merritt Island, FL Posts: 1,093	Re: how do I match speedo to new gears? The tire makers web site should have the revs-per-mile info for each particular tire they make on a spec sheet __________________ Tom 2004 Azure Blue, Manual, IUP #5210 4.10's Magnum 500's Eibach Sportlines/ Bilstein MM Panhard Bar Toyo 295 & 265/35/18's MGW Shifter JLT RAI Predator Tune PHP Intake Spacer SLP LM I Catback & Catted X IAC Restrictor CJ Emblems

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